Combined latch and lock



(N0 Modhel.)

w .& Iii- V A. A.;SMITH. COMBINED LATCH 'AND LOGK.

UNITED STATES PATENT OFFICE.

ANDREIV A. SMITH, OF HOTOHKISS, ASSIGNOR OF ONE-HALF TO WILLIAM H.CROTSER, OF DELTA, COLORADO.

COMBINED LATCH AND LOCK.

SPECIFICATION forming part of Letters Patent No. 550,423, dated November26, 1895.

Application filed May 14, 1895. Serial No. 549,279. (No model.)

To all whom it may concern.

Be it known that 1, ANDREW A. SMITH, a citizen of the United States,residing at Hotchkiss, Delta county, Colorado, have invented certain newand useful Improvements in a Combined Latch and Look, of which thefollowing specification contains a full, clear, and exact description,reference being had to th accompanying drawings, in which Figure 1 is aside elevation of the improved combined latch and lock with the knobshown in dotted lines. Fig. 2 shows a portion of the door provided withthe escutcheon, which has a keyhole and knob-spindle opening, the knobbeing shown in dotted lines. Fig. 3 is a rear view of the latch-frame.Fig. 4 is a detail perspective of .the latch removed. Figs. 5, 6, and 7are details showing the locking-dog, the knob-spindle tumbler or cam,and the key.

My invention relates to that class of latches which are provided withmeans for preventing retraction of the latch. The object of theinvention is to'provide such a latch with a pivoted dog or detent havinga hub provided with key-engaging device, by which it may be rotated tothrow the dog or detent into its active and inactive positions, thelatch being incapable of retraction after being released so long as thekey remains in the said hub; also, to provide the latch with a skeletonframe adapted to be inserted in a mortise; also, to render such latchsimple and inexpensive and capable of being easily repaired.

A represents the skeleton frame, which is formed in two pieces withoutthe necessity of side plates. This frame consists in the faceplate A andthe three-sided back plate or rim A the ends of which are provided withapertured off-sets a a, through which are passed the rivets or screws aa, which secure the two parts of the frame together. The inner face ofthe face-plate A is formed with an apertured lug o to which thelatch-operating spring is secured, as will be presently more fullydescribed. Upon the outer side of the lower corner of the back plate Ais formed a pair of spaced bearings a", the space between whichregisters with a slot a, extending through the back plate or rim A asshown in Fig. 3.

B is the latch, sliding through the usual opening in the face-plate andhaving a reduced rear end sliding through an opening in the rear side ofthe back plate A and provided at its extremity with a head B. The latchBis provided between its ends with a depending bifurcated arm B thelower end of which is provided with a transverse opening B intersectingthe bifurcation or slot 1).

O is the locking dog or detent, having a curved or T head at its freeend and an aperture c in its rear. This apertured end of the dog ordetent O is passed into the slot or bifurcation 12 until it registerswith the opening B when the hub O is inserted. The tubular hub O turnsfreely in the opening B but will fit firmly in the aperture 0, so thatwhen the hub is turned the dog or detent will be turned with it.

The dog or detent. C may be swung from,the position shown in full lines,Fig. 1, to that shown in dotted lines, the slot or bifurcation I) beinglong enough to allow the dog to swing freely through it. The ends of thehub O are provided with notches c at opposite sides of its central boreor key-opening to receive the bits of the key D. (Shown in Fig. 7.)

E is the knob-spindle cam or tumbler, having the usual arms or tappets ec and having a hub 6 which is mounted in the bearings a This hub has asquared opening, as usual, for the knob-spindle, and it is connectedwith the arms or tappets e e in the same manner as the dog 0 and its hubO are connected. The cam or tumbler E works in the space between the twobearings a and to economize space the upper arm or tappet e is adaptedto work in the slot a F is a bow-spring, riveted 'at its lower end tothe lug a and it extends upwardly around the cam E in engagement withboth of its arms, the upper end of the spring being forked, as shown atf, to receive the rear headed endv B of the latch. It will be seen,therefore, that when the knob (shown in dotted lines, Fig. 2) is turnedin either direction one or the other arm of the cam E will pressrearwardly on the spring and cause it to retract the latch B. The latchmay be thus retracted whenever the dog or detent is swung forward, asshown in full lines, but when swung to the rear the latch will belocked.

In both positions of the dog or detent 0 one end of its curved head willalways rest on the bot-tom of the back plate A and thus maintain the dogin a horizontal position.

Upon opposite sides of the door are secured the escutcheons G, each ofwhich has a vertically-extending keyhole g to register with the openingand notches c of the hub C, while to the right of the keyholeaknob-spindle aperture g is formed.

It will be seen that when a person inserts the key and throws thelocking dog or detent to its inactive or forward position the latchcannot be retracted until the key is with drawn, and hence the danger ofletting the key remain in the lock is wholly obviated.

All parts of the lock are visible and accessible for repair, &c., asthere is no closed casing, and the advantages and construction of thelock may be explained by salesmen without having to take off any sideplates.

Having thus described the invention, what is claimed is 1. Thecombination with the latch and its operating means, of a detent or dogpivoted to and carried by the latch and provided at its axis with meansfor engaging a key; whereby the latch cannot be operated until the keyhas been removed from said dog or detent, substantially as described.

2. The combination with the latch and its operating means, of a lockingdog or detent, having a hub pivoted to the latch and provided with meansfor engaging a key by which it may be rotated to swing the dog into itsactive and inactive positions, substantially as set forth.

The combination with the latch having an operating spring and a knobspindle cam by which the latch is retracted, of a dog or detent having ahub pivoted to the latch and provided with means for engagementby a keyby which it may be rotated to swing the dog or detent down to the rearand prevent retraction of the latch, substantially as set forth.

4. The combination with the latch and its operating means, of a lockingdog or detent provided with a tubular hub pivoted to the latch andhavingnotched ends to receive the key bit by which the dog or detent maybe swung to the rear to prevent retraction of the bolt, substantially asset forth.

5. The combination with the latch having a bifurcated arm or bearingbetween its ends, a key operated hub mounted to rotate in said arm orbearing, and a locking dog carriedby and turning with the hub andadapted to. be swung thereby to the rear and block rearward movement ofthe latch, substantially as set forth.

6. The combination with the skeleton. frame having a face plate and aback plate or rim provided with a bearing, of the latch guided in theface and back plate, an operating spring for the latch and a knobspindle cam or tumbler pivoted in said back plate bearing andconstructed to retract the latch, substantially as set forth.

7. The combination with the skeleton frame, of the latch guided thereinand pro j ecting in rear thereof, of a knob spindle cam or tumblerpivoted to the rear of the back plate below the latch, and a plate orbow spring secured to the frame, extending around the said spindle-camin engagement therewith, and connected at its upper free end with therear end of the latch, substantially as set forth.

8. A latch comprising the skeleton frame the latch guided therein andextending through the back plate, said latch having a depending armbetween its ends, a locking dog or detent having a key operated hubmounted on the lower end of said arm, and adapted to be swung downthereby into engagement with the rear wall of the back plate, a plate orhow spring, the free end of which passes up behind the back plate to andconnected with the rear end of the latch, and a knob-spindle cam mountedon the rear of the back plate to force the spring rearwardly and retractthe latch, substantially as set forth.

9. The combination with the latch and its operating means, of a lockingdog or detent pivoted at one end to a depending portion of the latch andprovided with a curved or T-head at its free end adapted at its ends torest on the bottom of the latch frame and when swung to the rear toengage the back of the frame and prevent retraction of the latch; thehub or axis of the dog having key receiving devices by which it may beoperated, substantially as set forth.

10. A mortise latch consisting in the frame comprising a face plate anda back plate or band having bearings at its lower rear cornor, a latchsliding through the face plate and back plate or band, and having adepending arm carrying the locking dog having a key operated hub, theknob-spindle cam mounted on the back platebearings, the bow springextending around the said cam to the rear end of the latch and theescutcheon having a key-hole registering with the hub and an openingregistering with the spindle opening, substantially as set forth.

11. The combination with the skeleton frame and the latch, of a springsecured at one end to the face" plate and at its free end engaging thelatch to project or throw it and means for retracting the latch,substantially as set forth.

ANDR'INV A. SMITH.

\Vitnesses II. R. HIoE, Gnoi H. Dnnn.

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